Consolidated Statements of Operations - USD ($) shares in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Revenues	$ 1,516,000,000	$ 1,749,700,000	$ 2,752,400,000
Cost of revenues:	1,161,500,000	1,327,400,000	2,178,400,000
Selling, engineering, and administrative expenses:	179,600,000	189,600,000	217,000,000.0
Lease portfolio sales (Note 1)	54,100,000	17,300,000	50,500,000
Gain (Loss) on Disposition of Other Assets	24,100,000	2,700,000	3,900,000
Gains on dispositions of property:	78,200,000	20,000,000.0	54,400,000
Impairment of long-lived assets	0	396,400,000	0
Restructuring activities, net	(3,700,000)	10,900,000	14,600,000
Total operating profit (loss)	256,800,000	(154,600,000)	396,800,000
Interest expense, net	191,400,000	211,000,000.0	214,500,000
Loss on extinguishment of debt	11,700,000	5,000,000	0
Pension plan settlement	(600,000)	151,500,000	0
Other, net	(900,000)	2,500,000	1,100,000
Other (income) expense:	201,600,000	370,000,000.0	215,600,000
Income (loss) from continuing operations before income taxes	55,200,000	(524,600,000)	181,200,000
Current Income Tax Expense (Benefit)	2,800,000	(512,600,000)	6,200,000
Provision for deferred income taxes	13,100,000	238,500,000	52,600,000
Provision (benefit) for income taxes:	15,900,000	(274,100,000)	58,800,000
Income (loss) from continuing operations	39,300,000	(250,500,000)	122,400,000
Gain on sale of discontinued operations, net of provision for income taxes of $51.9, $—, and $—	131,400,000	0	0
Income from discontinued operations, net of provision for income taxes of $3.5, $5.5, and $1.7	11,100,000	24,300,000	13,700,000
Net income (loss)	181,800,000	(226,200,000)	136,100,000
Net loss attributable to noncontrolling interest	(200,000)	(78,900,000)	(1,500,000)
Net income (loss) attributable to Trinity Industries, Inc.	$ 182,000,000.0	$ (147,300,000)	$ 137,600,000
Income (loss) from continuing operations	$ 0.39	$ (1.48)	$ 0.98
Income from discontinued operations	1.40	0.21	0.11
Basic net income (loss) attributable to Trinity Industries, Inc.	1.79	(1.27)	1.09
Income (loss) from continuing operations	0.38	(1.48)	0.96
Income from discontinued operations	1.37	0.21	0.11
Diluted net income (loss) attributable to Trinity Industries, Inc.	$ 1.75	$ (1.27)	$ 1.07
Basic weighted average shares outstanding	101.5	115.9	125.6
Diluted weighted average shares outstanding	103.8	115.9	127.3
Manufacturing [Member]
Revenues	$ 781,400,000	$ 948,200,000	$ 1,636,100,000
Cost of revenues:	769,900,000	910,000,000.0	1,462,200,000
Selling, engineering, and administrative expenses:	32,500,000	38,600,000	60,100,000
Leasing [Member]
Revenues	734,600,000	801,500,000	1,116,300,000
Cost of revenues:	391,600,000	417,400,000	716,200,000
Selling, engineering, and administrative expenses:	50,600,000	51,300,000	49,500,000
Product and Service, Other
Selling, engineering, and administrative expenses:	$ 96,500,000	$ 99,700,000	$ 107,400,000